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I'm trying to get the "long term persistent download link" to files in our Firebase storage bucket.
I've changed the permissions of this to

service firebase.storage {

  match /b/project-xxx.appspot.com/o {

    match /{allPaths=**} {

      allow read, write;

    }

  }

}

And my javacode looks like this:

private String niceLink (String date){

    String link;

    // Points to the root reference

    StorageReference storageRef = FirebaseStorage.getInstance().getReference();

    StorageReference dateRef = storageRef.child("/" + date+ ".csv");

    link = dateRef.getDownloadUrl().toString();

    return link;

}

When I run this I get the uri link that looks something like
com.google.android.gms.tasks.zzh@xxx

Question 1. Can I from this get the download link similar to: https://firebasestorage.googleapis.com/v0/b/project-xxxx.appspot.com/o/20-5-2016.csv?alt=media&token=b5d45a7f-3ab7-4f9b-b661-3a2187adxxxx

When trying to get the link above I changed the last row before my return, like this:

private String niceLink (String date){

    String link;

    // Points to the root reference

    StorageReference storageRef = FirebaseStorage.getInstance().getReference();

    StorageReference dateRef = storageRef.child("/" + date+ ".csv");

    link = dateRef.getDownloadUrl().getResult().toString();

    return link;

}

But when doing this i get a 403 error, and the app crashing. The consol tells me this is bc user is not logged in /auth.
"Please sign in before asking for token"

Question 2. How do I fix this?

When you call getDownloadUrl(), the call is asynchronous and you must subscribe on a success callback to obtain the results:

// Calls the server to securely obtain an unguessable download Url

private void getUrlAsync (String date){

    // Points to the root reference

    StorageReference storageRef = FirebaseStorage.getInstance().getReference();

    StorageReference dateRef = storageRef.child("/" + date+ ".csv");

    dateRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>()

    {

        @Override

        public void onSuccess(Uri downloadUrl) 

        {                

           //do something with downloadurl

        } 

    });

}

This will return a public unguessable download url. If you just uploaded a file, this public url will be in the success callback of the upload (you do not need to call another async method after you've uploaded).

However, if all you want is a String representation of the reference, you can just call .toString()

// Returns a Uri of the form gs://bucket/path that can be used

// in future calls to getReferenceFromUrl to perform additional

// actions

private String niceRefLink (String date){

    // Points to the root reference

    StorageReference storageRef = FirebaseStorage.getInstance().getReference();

    StorageReference dateRef = storageRef.child("/" + date+ ".csv");

    return dateRef.toString();

}

//Firebase easy and Working uploads and downloads.

@Override

protected void onActivityResult(int requestCode, int resultCode, @Nullable final Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == RC_SIGN_IN){

        if(resultCode == RESULT_OK){

            Toast.makeText(this,"Signed in!", LENGTH_SHORT).show();

        } else if(resultCode == RESULT_CANCELED){

            Toast.makeText(this,"Signed in canceled!", LENGTH_SHORT).show();

            finish();

        }

    } else if(requestCode == RC_PHOTO_PICKER && resultCode == RESULT_OK){



        // HERE I CALLED THAT METHOD

        uploadPhotoInFirebase(data);



    }

}



private void uploadPhotoInFirebase(@Nullable Intent data) {

    Uri selectedImageUri = data.getData();



    // Get a reference to store file at chat_photos/<FILENAME>

    final StorageReference photoRef = mChatPhotoStorageReference

                    .child(selectedImageUri

                    .getLastPathSegment());



    // Upload file to Firebase Storage

    photoRef.putFile(selectedImageUri)

            .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {

                @Override

                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {



                    // Download file From Firebase Storage

                    photoRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {

                        @Override

                        public void onSuccess(Uri downloadPhotoUrl) {

                            //Now play with downloadPhotoUrl

                            //Store data into Firebase Realtime Database

                            FriendlyMessage friendlyMessage = new FriendlyMessage

                                    (null, mUsername, downloadPhotoUrl.toString());

                            mDatabaseReference.push().setValue(friendlyMessage);

                        }

                    });

                }

            });

}

StorageReference mStorageRef = FirebaseStorage.getInstance().getReference();



final   StorageReference fileupload=mStorageRef.child("Photos").child(fileUri.getLastPathSegment());

UploadTask uploadTask = fileupload.putFile(fileUri);



Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {

    @Override

    public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {

        if (!task.isSuccessful()) {

            throw task.getException();

        }

        return ref.getDownloadUrl();



    }

    }).addOnCompleteListener(new OnCompleteListener<Uri>() {

        @Override

        public void onComplete(@NonNull Task<Uri> task) {

            if (task.isSuccessful()) {

                Uri downloadUri = task.getResult();

                Picasso.get().load(downloadUri.toString()).into(image);



            } else {

                 // Handle failures

            }

       }

});